///    author : leo
///    e-mail : jkliao@yeah.net
///    date   : 2020-03-2922:41
///    desc   :
 class Code {
   static const SUCCESS = 0;
   static const FAILURE = 1;
   static const NETWORK_ERROR   = -1;
   static const NETWORK_TIMEOUT = -2;
   static const NETWORK_NONE    = -3;
   static const SERVER_ERROR    = -4;
 }